<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .container{
        display: flex;
        width: 500px;
        height: 300px;
        /* border: 1px solid black; */
        margin: 30px auto;
        justify-content: space-around;
        align-items: flex-end;
        text-align: center;
        color: white;
    }

    .item{
        width: 80px;
        background-color: skyblue;
    }

    .h50{
        height: 50px;
    }

    .h100{
        height: 100px;
    }

    .h150{
        height: 150px;
    }

    .h200{
        height: 200px;
    }

    .h250{
        height: 250px;
    }
</style>
<body>
    <div class="container">
        <div class="item h50"><p>第一阶段</p></div>
        <div class="item h100"><p>第二阶段</p></div>
        <div class="item h150"><p>第三阶段</p></div>
        <div class="item h200"><p>第四阶段</p></div>
        <div class="item h250"><p>第五阶段</p></div>
    </div>
</body>
</html>